So I jump back into Halo after 3 months to see the new maps. I create a private custom game with breaker and no one else and when the game timed out on it’s own, I get the following message. “You have been temporarily suspended from matchmaking for unsporting play. Your suspension will end at the following time: …”
Apparently I am being punished for playing by myself. I knew there was a reason I started playing Destiny 2 again.
That’s hilarious… except, you know, for the bit where you were actually banned.
Did you do anything three months ago? I don’t know how their suspension / message system works but it may have just been a queued message from something you did before and it waited until the end of your next game? And if this is the case, I’m guessing you’ve already served your ban…
No… I’ve never been banned or suspended previously. Apparently the “ban” carries over to when I try to play the actual multiplayer . I litterally have now only played two… TWO! custom games in season 2 that were private that I set up with just myself so that I could check out the two new maps before I jump into actual games and I am now BANNED! For playing by myself!
WTF 343!!!
Just for clarification, The end of the first custom-by-myself game said I was suspended after I was checking out breaker. The second custom-by-myself game, I was checking out catalyst and when the time ended it said I was banned. Literally my first two “games” back.
Then I immediately tried to enter an actual multiplayer match and it says that this user is banned. I don’t know whether to laugh or cry.
I’d do both. Over a beverage of age appropriate constituents.
Banned for playing …with yourself … naughty naughty…
In all seriousness tho, I’d submit a support ticket and explain what happened. I would like to believe that ‘if exactly what you described’ happened to me, they would actually help.
Playing Infinite is punishment all by itself,
This is just sadistic design on the part of the Devs.
I suggest you open a support ticket. If you are having this issue, there are surely others. Something like this is inexcusable and will cause people to quit playing.
As others have recommended open a support ticket. I’d probably also tweet out your issue to larger Halo personalities and the support handle. Someone was banned for a month for exclusively playing bot slayer, and they shared their issue pretty publicly on twitter. I think within a couple of days the ban was reversed.
I was banned on Halo Infinite for playing a custom game by myself and then ending the game after about 8 minutes. The same thing happened to my friend a few hours ago. This seems to be an ongoing problem.
Stop playing with yourself… it’s considered unseemly. 
343 right now…
“They complain when they play Halo Infinite then they complain when we stop them playing Halo Infinite… I just don’t understand what are we meant to do to make these people happy?!?”
I just got banned for “unsportsmanlike behavior” when i was helping fix someones setting in a custom game and ended it. This is ridiculous. It makes me not wanna play this game
I’d open a support ticket about it. I’m going to test it myself today.
I’m tempted to idle in a private custom game tonight a few times to see if I can replicate this. I would not be surprised in the slightest if you can get quit bans for private custom games.
Sounds exactly like something 343 would do considering they can barely do anything right.
I got banned too. 
I opened custom match of Arena: Attrition on Breaker, on Azure server. Idle for 5 mins, end match, get notification I’m banned for 10 minutes.
https://imgur.com/a/iToD8Em
I opened a support ticket. It is only on Azure server, since you are technically connecting to their game servers.
Second match test I idled for 4 mins, this time banned for 40 mins.
Lastly, I tested custom on offline and didn’t get banned, so it must be their server.
How could you forget to include others? So rude of you.
So i got banned for helping others with their settings by starting a custom game then ending it (see my above comment)
I opened a support ticket and got a reply, this is what was said
Hi Starz PLURR,
After reviewing all available information, we have identified enough evidence to reduce/remove your current Halo Infinite enforcement action. As a result, we have removed/reduced your suspension to 0 days.
Thank you for following-up with us and we appreciate the chance to further investigate this.
Halo Agent November
I’m seeing lots of reports of this.
It’s clearly a new bug that somehow popped up.
Please submit a ticket so they have more info.
Now someone needs to test if custom games affects sbmm like bot bootcamp